Materials for temperatures above 1500°C in oxidizing atmospheres Part II: Experimental results on the oxidation of MoSi2 composites and coated RSiC

Abstract

The topic "Materials for temperatures above 1500°C in oxidizing atmospheres" is discussed in a 3 part publication. In the first part a literature survey had been performed leading to the conclusion that either particle or fiber reinforced MoSi2-based materials or RSiC coated with a MoSi2-based layer are suitable for applications at such high temperatures. In the present part such material systems are investigated experimentally at 1500 and 1600°C with respect to their oxidation resistance in air. Particular interest was given to the influence of the Mo5Si3 content in MoSi2 and the influence of second phase particles in MoSi2 consisting of ZrB2 and SiC. Furthermore, the oxidation resistance of several dip-coatings on RSiC which were manufactured from a polysiloxane precursor by subsequent pyrolysis were also investigated. Part III which reports about "contact corrosion" between different materials at these temperatures will follow in the next issue. © WILEY-VCH Verlag GmbH, 2001.